EP0210181B1 - Systeme radio a partage de plusieurs canaux d'emission - Google Patents

Systeme radio a partage de plusieurs canaux d'emission Download PDF

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Publication number
EP0210181B1
EP0210181B1 EP85905981A EP85905981A EP0210181B1 EP 0210181 B1 EP0210181 B1 EP 0210181B1 EP 85905981 A EP85905981 A EP 85905981A EP 85905981 A EP85905981 A EP 85905981A EP 0210181 B1 EP0210181 B1 EP 0210181B1
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EP
European Patent Office
Prior art keywords
word
channel
subscriber unit
outbound
signalling
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EP85905981A
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German (de)
English (en)
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EP0210181A1 (fr
EP0210181A4 (fr
Inventor
Kenneth John Zdunek
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Motorola Solutions Inc
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Motorola Inc
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Application filed by Motorola Inc filed Critical Motorola Inc
Priority to EP90117730A priority Critical patent/EP0411677B2/fr
Priority to AT85905981T priority patent/ATE67908T1/de
Publication of EP0210181A1 publication Critical patent/EP0210181A1/fr
Publication of EP0210181A4 publication Critical patent/EP0210181A4/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/08—Trunked mobile radio systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0072—Error control for data other than payload data, e.g. control data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • H04W76/45—Connection management for selective distribution or broadcast for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Definitions

  • This invention relates to the field of trunked radio systems and specifically to an improved method and means of dispatch trunked radio control which provides an expanded array of features including uninterupted private communication between trunked subscriber units.
  • Trunked radio systems have developed in response to an ever increasing demand for radio communications services. Previous radio communications systems have expanded to the point where potential users are denied service because the available frequency resource is being utilized. Typically, subscribers using older mobile radio system were constrained to operate on a single frequency, thus limiting the number of users which could be expected to be assigned to that frequency, thus limiting the number of users which could be expected to be assigned to that frequency. Trunked radio systems alievate this inherent spectrum limitation by actively assigning operating frequencies to mobile radios based on channel availability. In other words, the mobile radios used as subscriber units in trunked radio systems are operative on a number of frequenices which are assigned to the subscriber unit 102 based on channel availablity.
  • a prior trunked radio system is shown and described in United States patent number 4,012,597, entitled “Transmission Trunked Multichannel Dispatch System with Priority Queuing", by Lync et al., filed November 24,1975 and assigned to Motorola, Inc., Schaumburg, Illinois.
  • the trunked radio system described in this patent is referred to as a dispatch trunked radio system.
  • a dispatch trunked radio system a mobile radio establishes communication on the system by transmitting a channel request to a system central controller on a predetermined inbound frequency.
  • the central control unit responds to the subscriber unit with a signalling word which authorizes the subscriber unit to operate on a specific communication channel.
  • the channel request transmitted from the subscriber unit includes information which identifies the subscriber unit to the central control unit. Additionally, the subscriber unit responds to commands sent from the central control unit based on radio I.D. information included with outbound channel assignment information.
  • radio I.D. information included with outbound channel assignment information.
  • Prior dispatch trunked radio systems developed around a basic unifying protocal which communicates radio I.D. and channel assignment information. However, these systems are inherently limited in the type of features which may be implemented because of the limited amount of information which is communicated between the central control unit and the mobile radios of the dispatch trunked radio system.
  • the present invention contemplates a dispatch trunked radio system in accordance with claim 1 and a method of controlling a dispatch trunked communication system in accordance with claim 3.
  • the invention provides an expanded unifying signalling protocol which may be advantageously used to implement enhanced system features which remaining compatible with prior dispatch trunked radio system.
  • the subscriber units are preferably capable of generating and receiving signalling information in accordance with a single word or concatenated dual-word signalling scheme.
  • the central control unit also preferably decodes and generates signalling information in accordance with a single or concatenated dual-word signalling scheme of the present invention.
  • the invention facilitates secure individual mobile-to-mobile radio communication without regard to secondary fleet, sub-fleet, or group assignments.
  • a method and means are provided for a subscriber unit to receive a private call from another subscriber unit even thought the subscriber unit may be present to receive calls on the sub-fleet level. It is another advantage of the present invention that a method and means are provided for a subscriber unit to receive a private call from another subscriber unit to respond to the call in a totally private manner.
  • Figure 1 is block diagram of a dispatch trunked radio system.
  • Figures 2a and 2b are diagrams of the inbound and outbound signalling word formats of a prior dispatch trunked radio system, before channel encoding.
  • Figure 3 is a diagram detailing the individual conversations made possible on a trunked system by execution of the protocol of the present invention.
  • Figures 4a and 4b are diagrams of the inbound and outbound signalling word formats of the dispatch trunked radio system of the present invention, prior to channel encoding.
  • Figure 5 is a detailled timing diagram detailing the communication between a subscriber unit and the central control unit during the execution of the protocal of the present invention.
  • FIGS 6 through 8 are flow diagrams detailling the overall operation of the present invention.
  • Figure 9 is a diagram showing the contents and encoding of the first word of the ISW of the present invention which contains the subscriber unit identification (I.D.) code of the requesting unit.
  • I.D. subscriber unit identification
  • Figure 10 is a diagram showing the contents and encoding of the second ISW word which contains the I.D. of target mobile.
  • Figure 11a describes in detail the procedure for encoding each of the ISW's.
  • Figure 11b illustrates the form of the dual ISW request as it is presented to the FM modulator of the requesting radio.
  • Figures is a diagram showing the encoded first portion of the Inbound Signalling Word of Figure 9.
  • Figures 13 is a diagram showing the second portion of the Inbound Signalling Word of Figure 9.
  • Figure 14a is a time sequence diagram showing the encoding process associated with the Outbound Signalling Word generated in accordance with the signalling protocal of the present invention.
  • Figure 14b is a diagram showing the data word structure which results from the coding process of Figure 14a.
  • FIGS 15 through 17 are detailed control flow diagrams detailing the step-by-step operation of the present invention.
  • the dispatch trunked radio system 100 consists of subscriber units 102, 104 (mobiles or portables), trunked repeaters 106, and a trunking central controller 110.
  • the trunked central controller 110 and trunked repeaters 106 may also connected to an "interconnect control unit" (not shown) which serves to connect the trunked repeaters 102 to a public switched telephone network.
  • an "interconnect control unit” not shown
  • all subscriber units monitor the outbound frequency of the trunked repeater 108 which is designated the "control channel.”
  • a subscriber unit sends a date packet called a ISW (Inbound Signaling Word) on the inbound frequency of the Control Channel repeater.
  • the ISW contains the requesting unit's unique ID code, consisting of a fleet ID and an individual ID, plus a "subfleet” code indicating to which group of units it wants to talk to.
  • the ISW also contains a unique "call type” code which indicates that a dispatch call is the type of call desired.
  • the request if forwarded to the Central Controller, which decodes the request, and transmits a data packet called an OSW (Outbound Signaling Word) to all the subscriber units which are monitoring the outbound Control Channel.
  • OSW Outbound Signaling Word
  • the OSW is a "channel grant" which contains the subfleet code, the requesting unit's ID code, and the voice channel number assigned for the conversation.
  • the OSW causes the requesting unit to move to the voice channel as listening units. In this way a group of "subfleet" call conversation may be established. If all the voice channels are in use, the Central Controller sends the requesting subscriber unit a "Busy OSW".
  • a fixed end central control unit for a dispatch trunked radio system which may advantageously used with the present invention is set forth in Motorola, Inc. instruction manual number 68P81047E50-0, entitled “Trunked Radio System Central Controller”. Repeaters suitable for use with the present invention are described in Motorola, Inc.
  • FIG 2 the standard decoded ISW's and OSW's are shown in detail.
  • the ISW's and OSW's are encoded for error correction, detection, and packet sync according to the procedures described in Figures 11a and 14a, respectively.
  • the information sources mentioned in block 1102 of Figure 11 and block 1402 of Figure 14 for the standard ISW's and OSW's are shown in Figures 4b and 4a, respectively.
  • FIG. 3 there is shown a diagram detailing the individual conversations made possible by execution of the present invention.
  • the present invention provides for totally private conversations between any two subscriber units on the dispatch trunked radio system.
  • a "dual" or “paired" ISW format is used to send requests for various types of radio calls, and a dual OSW is used for the corresponding channel grant.
  • An example of the types of calls which are supported by the signaling protocal of the present invention areas follows: A subscriber unit can initiate a totally private call to a another subscriber unit 104 in the same fleet.
  • the present invention provides that the the target unit 104 can respond in a totally private manner to the initiating caller.
  • a subscriber unit can initiate a totally private call to another subscriber unit which is not in the same fleet as is shown by the conversation between units 1 and 3 of Figures 1 and 3.
  • the target unit 103 can respond in a totally private manner to the initiating caller, unit 1.
  • Each line indicates a totally private conversation which may be initiated by any party shown in Figure 3.
  • Figures 4a and 4b illustrate signalling word formats which are available in a system using the signalling protocal of the present invention.
  • an Inbound Signalling word may be concatenated in a "Dual Word" format to extend the number of inbound instructions available to the Central Controller 110 of Figure 1.
  • the specific organization of the concatenated Inbound Signalling Word of the present invention is shown in Figure 4a.
  • OSW's may be concatenated in a "Dual Word" format to extend the number of outbound messages and addresses which may be generated to control the subscriber units.
  • the principles of the present invention provide that decoded dual-word OSW's have a predetermined form.
  • the present invention provides that the first word of the signalling sequence must contain a "First Word" identifying code in the Status Field.
  • the second word follows in the word slot immediately following the first, and contains a channel number or status indicating code in the 10 bit field.
  • the principles of the present invention provide that the interpretation of the 16 bit "ID" field in the Second Word depends on the contents of the Status Field of the first inbound signalling word.
  • the OSW's described above may be encoded for transmission on the outbound control channel for sync, error correction and detection according to patents set forth above
  • the central controller transmits the encoded dual OSW in successive 23.3 millisecond time slots on the Outbound Control Channel.
  • FIG. 5 shows a standard dispatch trunked system channel access procedure.
  • the subscriber unit 102 requesting service sends a voice channel request "A" in the form of an ISW (Inbound Signalling Word) to the Fixed End Trunking Controller on the inbound control channel.
  • the ISW may take the form of a single or dual word ISW.
  • the fixed end central controller 110 responds with a voice channel grant "B" in the form of an OSW (Outbound Signalling Word) on the outbound control channel as shown.
  • OSW Outbound Signalling Word
  • the fixed end central controller 110 responds with a Dual Word OSW if a dual word ISW was received from the subscriber unit.
  • a high speed acknowledge signal is sent on the outbound assigned voice channel.
  • the high speed acknowledge signal contains the group identification code of the requesting unit and is sent at 3600 BPS.
  • the subscriber unit requesting service After detecting the channel grant on the control channel, the subscriber unit requesting service changes frequencies to the assigned voice channel, and decodes the high speed handshake signal from the fixed end central controller 110. It then responds with a high speed acknowledge tone "C" which indicates to the fixed end central controller 110 that it has successfully reached the voice channel.
  • the fixed end central controller 110 Upon detecting the high-speed acknowledge signal from the subscriber unit, the fixed end central controller 110 enables the audio path in the assigned repeater, removes the high speed handshake, and starts sending a sub-audible low speed handshake containing the group I.D. of requesting unit.
  • line “D” shows that the transmitting subscriber unit 102 enables the microphone audio and begins to send voice with a sub-audible low speed handshake signal.
  • receiving mobile units enable the audio to their speakers when they decode the low-speed handshake signal from the fixed end central controller 110.
  • Lines "F", and “G” represent that voice and sub-audible low speed acknowledge, and voice and sub-audible low speed handshake are sent continuously on the inbound and outbound voice channel for the duration of the requesting mobile transmission.
  • the voice channel grant "H” in the form of an OSW is repeated on the outbound control channel for the duration the requesting mobile transmission.
  • the controller After a time interval expires after mobile disconnect is received at the trunking fixed end central controller 110, the controller sends a sub-audible central disconnect signal "J" on the outbound voice channel. This signal causes all subscriber units on the voice channel to return to the control channel. The voice channel is now available for reassignment to a new call.
  • Figure 17 illustrates the general mechanism by which a requesting (or target) subscriber unit interprets concatenated dual word OSW's in accordance with the method of the present invention.
  • the procedure starts with item 1702 when a valid OSW word is decoded in a receiving radio.
  • Decision 1704 determines whether the decoded word contains a single word code in the 10 bit status field. If a single word code was detected, decision 1726 checks the ID code. If the I.D. matches that of the requesting unit, then the single word OSW command is processed at item 1730. If decision 1726 does not detect a proper I.D., the OSW command is discarded at item 1728.
  • the 1st word buffer is checked by decisions 1714 and 1716. If no first word has been received, then the second word is discarded by item 1720. If a first word is present in the buffer, then the timer started in 1710 is checked by decision 1716. If more than two OSW word times (46 Ms.) have elapsed, then the second word cannot be part of the dual word pair, and both words are discarded by items 1718 and 1720.
  • Figures 6 through 8 are flow diagrams detailling the overall operation of the present invention.
  • Figure 6 describes dual word signalling operation from the viewpoint of the mobile subscriber unit requesting the an enhanced system feature.
  • a subscriber unit is operated in a quiescent mode represented by item 602 where the subscriber unit is monitoring the outbound control channel in a subfleet mode. In this mode the subscriber unit will respond to calls on a group level.
  • the operator selects a target subscriber via pushbutton or keypad and display, (item 604), and asserts the PTT switch (item 606).
  • a dual word ISW is then transmitted to the fixed end central controller 110 by item 608 on the inbound control channel.
  • the contents and encoding of the first word of the ISW is described in further in conjunction with Figure 9.
  • the first word contains the subscriber unit identification (I.D.) code of the requesting unit.
  • FIG. 10 The contents and encoding of the second ISW word is described in conjunction Figure 10.
  • the second word contains the I.D. of target mobile.
  • Figure 11a describes in detail the procedure for encoding each of the ISW's.
  • the procedure for encoding the dual-word ISW's of the present invention may be the same as the procedure described above for single-word ISW's.
  • Figure 11b illustrates the form of the dual ISW request as it is presented to the FM modulator of the requesting radio.
  • decision 612 causes the subscriber unit to search for a channel "busy” or channel "grant” command on the outbound control channel from the central controller.
  • the channel "busy” or channel “grant” takes the form of a dual word OSW if a dual word ISW was received by the fixed end central controller 110.
  • the contents and encoding of the first word of the dual-word OSW is shown in Figure 12.
  • the first OSW contains the ID of the target unit 104 of the individual call.
  • the contents and encoding of second OSW is shown in Figure 13.
  • the second OSW contains the ID of the unit requesting the individual call.
  • Figure 14a illustrates in detail the procedure by which the first and second OSW words are encoded. The procedure may be the same as the encoding procedure for standard OSW's.
  • Figure 14B shows the form of dual OSW as it is received from the fixed end central controller 110.
  • item 614 causes the subscriber unit to wait for a dual word channel "grant".
  • a dual word grant is received immediately after the reqeust, or after a busy has been received, then the ID's in the first and second words are checked by decision 616.
  • the first word of the channel grant OSW must contain the I.D. of the target subscriber unit, the second word must contain the ID of the requesting unit. If the proper ID's are not present, then decision 616 selects item 610 which disregards the dual-word channel grant OSW. The subscriber unit then returns to item 608 and resends the dual ISW request.
  • item 618 causes the requesting subscriber unit to moves to the channel assigned by the second word of the dual word grant.
  • Item 620 then enables voice communication on the assigned channel.
  • the high-speed handshake and low-speed handshake signals described in Figure 5 are derived using the ID code of the subscriber unit requesting the dual word private call.
  • the first word must contain the radios own ID, and the second word of the dual OSW must contain the ID the unit previously requested. If these ID's are not present in the dual word, the command is discarded by decision 708, and the radio continues to wait for dual word grants.
  • a radio which has previously been a "target" radio uses the I.D. latched as the requesting unit to call that unit back.
  • the target radio operation for dual-word private call begins with item 802 in the group call mode on the control channel. If decision 804 detects a dual-word grant according to the procedure described in Figure 17, then decision 806 checks the I.D.'s. If the first word contains the radio's own I.D., and the second word contains a channel number in the status field, then the ID in the second word is assumed to be the I.D .of the initiating mobile and item 808 stores the I.D. to be used in responding to the initial caller if required. Item 810 then moves the target subscriber to the assigned voice channel and commences voice channel communication, expecting the high speed handshake and low speed handshake signals to be derived from the I.D. of the initiating radio which was stored by item 808 above. Voice channel communications continues until decision 812 detects system disconnect as described in Figure 5, "J". Item 814 then returns the target unit 104 to the control channel.
  • decision 816 passes control to the common operation routine 700 of Figure 7. If the private mode has not been engaged by the target radio operator, decision 816 selects entry point 802 and the group call mode continues.
  • FIG 9 is a diagram showing the contents and encoding of the first word of the ISW of the present invention which contains the subscriber unit identification (I.D.) code of the requesting unit.
  • the information source for the first ISW word “A” consists of 21 bits comprised of the 16 bit requesting subscriber unit I.D., followed by the 5 bit binary sequence 01000.
  • the ISW encoding process “B” converts the 21 bit information source into a 78 bit data stream "C” to be sent over the channel.
  • the process “B” is further described in conjunction with Figure 11a. Starting with the 21 bit information sequence, the outer code 1104 and the auto-sync sequences 1106 are added according to the teachings of the patents set forth above.
  • FIG 10 is a diagram showing the contents and encoding of the second ISW word which contains the I.D. of target mobile.
  • the information source for the second ISW word "A” consists of 21 bits comprised of the 16 bit target subscriber unit I.D., followed by the 5 bit binary sequence 01001.
  • the ISW encoding process “B” converts the 21 bit information source into a 78 bit data stream "C” to be sent over the channel. The process “B” is further described in the patents set forth above.
  • Figure 11b illustrates the form of the dual ISW request as it is presented to the FM modulator of the requesting radio.
  • the two 78 bit ISW sequences derived according to the procedure described above are presented to the F.M. modulator of the subscriber unit as two serial binary sequences seperated by the 16 bit binary pattern 101010.
  • the 27 bit information sequence of Figure 4a consists of the 16 bit I.D. field of the target subscriber unit 104, followed by the binary number 1, and then followed by the 10 bit binary sequence "A" 1100001000.
  • the OSW encoding process "B” converts the 27 bit information field to 84 bits "C” to be sent over the R.F. channel.
  • Figures 13 is a diagram showing the second portion of the Outbound Signalling Word of Figure 4a.
  • the 27 bit information sequence consists of the 16 bit I.D. field of requesting subscriber unit, followed by the binary number 1, and then followed by the 10 bit binary sequence "A" which corresponds to a channel assignment or a predesiginated "busy” code.
  • the OSW encoding process "B” converts the 27 bit information field to 84 bits "C" to be sent over the R.F. channel.
  • Figure 15 illustrates how the Trunking Central Controller decides that two independantly decoded ISW's indeed form a concatenated dual word ISW from a mobile or portable unit.
  • the procedure starts when a single valid ISW word is decoded on the Inbound Control Channel at entry 1502. If decision 1504 detects a valid "single-word code" is in the 5 bit ISW status field, then control is passed to item 1522 which handles single word commands in accordance with conventional call processing techniques. If decision 1504 detects a dual-word code, then decision 1506 determines whether the first word code, or second word codes have been received. If the ISW received is a first word, then it is stored in a "First Word Buffer" by item 1510, and the time of reception is recorded.
  • the First Word Buffer is checked by decison 1508. If no first word is present, then item 1514 discards the second word ISW. If a first word is present in the buffer, then decision 1512 checks the time of reception. If the first word was received more than two word durations ago (46 ms.), then the 2nd word ISW just received, and the first word ISW in the buffer, are discarded by item 1520.
  • Figure 16 describes how the trunked system central controller processes dual word private call requests from mobiles and portables. The processing described here takes place between blocks 608 and 612 of Figure 6 (Requesting Mobile Processing). Control is passed to the private call procedure 1602 of the present invention after a dual-word private call ISW has been successfully decoded as described in Figure 15.
  • First decision 1604 checks the I.D. contained in the 2nd word of the dual ISW. This is the I.D. of the target radio. If the target subscriber I.D. is already active on the trunked system, then a dual word "busy" OSW is sent to the requesting unit by the fixed end central controller 110 by item 1610. As mentioned above, Figures 12,13, and 14 describe the specific formating and encoding of dual word OSW's. When a channel is released from serving a call by decision 1612, then the private call 2 procedure is restarted to determine whether the "busy" OSW can be replaced by a "channel grant" OSW. Otherwise, decision 1612 and item 1610 continue to send the dual-word "busy OSW".
  • the I.D. contained in the first word is assumed to be that of the initiating unit. This I.D. is also checked by decision 1606 to see whether it is currently involved in a channel assignment on the trunked system. If it is active, then a dual-word "busy" is sent by item 1610 according to the procedure described above.
  • item 1608 determines whether a channel is available for assignment to the private call. If a channel is not available, item 1610 is selected and the "busy" control sequence is entered as described above.
  • Voice Channel communications can commence at item 1620, as described according to the procedures of Figures 5,6,7, and 8.
  • the improved dispatch trunked radio system of the present invention may be advantageously used to implement enhanced system features while remaining compatible with prior dispatch trunked radio systems.
  • the subscriber units of the present invention are capable of generating and receiving signalling information in accordance with a single word or concatenated dual-word signalling scheme.
  • the central control unit also decodes and generates signalling information in accordance with a single or concatenated dual-word signalling scheme, and generates channel controlling information in accordance with the signalling scheme of the present invention. While the teachings of the present invention have been disclosed in the context of channel assignments the dual-word signalling protocal of the present invention may advantagously used to provide an array of other system features.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Claims (15)

  1. Un système de radiocommunication à canaux partagés avec appel de groupe, comprenant :
    a. un ensemble de répéteurs à canaux partagés (106) ;
    b. un ensemble de postes d'abonné (104) qui sont capables de générer et de recevoir de l'information de signalisation conformément à une procédure de signalisation ; et
    c. une unité de commande centrale (110) qui est destinée à décoder et à générer une information de signalisation conformément à la procédure de signalisation précitée, cette unité de commande centrale décodant des demandes de canal sous la forme de messages entrants qui proviennent de postes d'abonné, et émettant des attributions de canal vers les postes d'abonné, sur la base d'un algorithme de commande prédéterminé, caractérisé en ce que la procédure de signalisation comprenant des messages entrants et sortants, comprend un premier mot et un second mot facultatif, le premier mot contenant une demande de canal et une information qui indique que le second mot est présent, tandis que le second mot contient une information de commande de système.
  2. Le système de radiocommunication à canaux partagés avec appel de groupe selon la revendication 1, dans lequel la procédure de signalisation comprend :
    a. un premier mot de données entrant ayant un nombre de bits prédéterminé et organisé en champs, dans lequel une première partie de champ fixée représente un code d'identification spécifique du poste d'abonné demandeur, et un second champ fixé consiste en un champ de type d'appel qui représente des codes de commande de système, parmi lesquels un certain code ordonne à l'unité de commande centrale d'extrémité fixe de rechercher un second mot de données suivant ou de décoder le premier mot de signalisation entrant sous la forme d'un message à un seul mot ;
    b. un second mot de données entrant ayant un nombre de bits prédéterminé et organisé en champs, dans lequel une première partie de champ fixée représente un code d'identification spécifique du poste d'abonné destinataire, ou un code de fonction de système, sous la dépendance du contenu du champ de type d'appel du premier mot de signalisation entrant, et un second champ fixé représente un type d'appel désiré ;
    c. un premier mot de données sortant ayant un nombre de bits prédéterminé et organisé en champs, ce mot de données ayant un champ de préfixe fixé qui correspond à un code d'identification de poste d'abonné destinataire, une partie de bit individuel, et un champ d'état indiquant un état d'attribution de canal au poste d'abonné demandeur ; et
    d. un second mot de données sortant ayant un nombre de bits prédéterminé et organisé en champs, comportant un premier champ fixé, un champ de bit individuel et un second champ d'état de canal, ce second champ d'état de canal contenant une information qui est destinée à l'interprétation du contenu du champ de préfixe fixé et du premier champ fixé des mots de données sortants.
  3. Un procédé de commande d'un système de communication à canaux partagés avec appel de groupe, comprenant un ensemble de postes d'abonné (102), un ensemble de répéteurs à canaux partagés (106), et une unité de commande centrale d'extrémité fixe (110) connectée aux répéteurs à canaux partagés, dans lequel les postes d'abonné communiquent avec les répéteurs à canaux partagés sous la commande de l'unité de commande centrale d'extrémité fixe, caractérisé en ce que ce procédé comprend les étapes suivantes :
    a. un poste d'abonné effectue une demande de service en émettant une demande de canal vocal, sous la forme d'un double mot de signalisation entrant, vers l'unité de commande centrale d'extrémité fixe, sur un canal de commande entrant prédéterminé, par l'intermédiaire des répéteurs à canaux partagés ;
    b. le poste d'abonné reçoit une attribution de canal vocal, sous la forme d'un double mot de signalisation sortant sur un canal de commande sortant, ce double mot de signalisation sortant étant généré par l'unité de commande centrale d'extrémité fixe et émis par les répéteurs à canaux partagés ;
    c. le poste d'abonné reçoit un signal d'établissement de liaison rapide, sur un canal vocal attribué sortant, à partir de l'unité de commande centrale d'extrémité fixe, ce signal d'établissement de liaison rapide contenant un code d'identification du poste d'abonné demandeur ;
    d. l'unité de commande centrale d'extrémité fixe reçoit un signal d'acquittement rapide qui est émis par les postes d'abonné, sur le canal de commande entrant prédéterminé ;
    e. le poste d'abonné émet un signal d'acquittement lent vers l'unité de commande centrale d'extrémité fixe, par l'intermédiaire des répéteurs à canaux partagés ;
    f. le poste d'abonné reçoit un signal vocal et un signal d'établissement de liaison sous-audible lent, qui sont émis par les répéteurs à canaux partagés et qui proviennent de l'unité de commande centrale d'extrémité fixe ;
    g. on transmet simultanément un signal d'établissement de liaison sous-audible et un signal vocal entre le poste d'abonné et l'unité de commande centrale d'extrémité fixe, sur le canal vocal attribué, pendant la communication avec l'unité de commande centrale d' extrémité fixe ;
    h. un répéteur émet vers le poste d'abonné l'information de signalisation qui est générée par l'unité de commande centrale d'extrémité fixe, sous la forme d'un double mot, sur le canal de commande sortant, pendant la durée d'émission du poste d'abonné demandeur ;
    i. le poste d'abonné émet vers l'unité de commande centrale d'extrémité fixe un signal de déconnexion sous-audible, indiquant la fin de l'émission vers l'unité de commande centrale d'extrémité fixe ; et
    j. un répéteur émet vers le poste d'abonné un signal de déconnexion central sous-audible, au moyen de l'unité de commande centrale d'extrémité fixe, sur le canal vocal sortant, après la réception du signal de fin de transmission provenant du poste d'abonné.
  4. Le procédé selon la revendication 3, dans lequel le second mot de données facultatif doit être reçu au cours d'un intervalle de temps prédéterminé à partir de la réception du premier mot de données.
  5. Le procédé selon la revendication 3, dans lequel les messages entrants sont émis dans des créneaux temporels prédéterminés.
  6. Le procédé selon la revendication 3, dans lequel les messages sortants contiennent un préambule ayant un signal de synchronisation.
  7. Le procédé selon la revendication 3, dans lequel les premier et second mots sont décodés séparément, un mot à la fois.
  8. Le procédé selon la revendication 3, dans lequel la réception successive de deux premiers mots entraîne le rejet du premier mot reçu.
  9. Le procédé selon la revendication 3, dans lequel chacun des premier et second mots de données contient en outre des codes de correction d'erreur qui garantissent que les premier et second mots ont été reçus dans des créneaux temporels consécutifs.
  10. Le procédé selon la revendication 3, dans lequel le second mot de données facultatif doit être reçu pendant un intervalle de temps prédéterminé à partir de la réception du premier mot de données.
  11. Le procédé selon la revendication 3, dans lequel les messages entrants sont émis dans des créneaux temporels prédéterminés.
  12. Le procédé selon la revendication 3, dans lequel les messages sortants contiennent un préambule ayant un signal de synchronisation.
  13. Le procédé selon la revendication 3, dans lequel les premier et second mots sont décodés séparément, un mot à la fois.
  14. Le procédé selon la revendication 3, dans lequel la réception successive de deux premiers mots provoque le rejet du premier mot reçu.
  15. Le procédé selon la revendication 3, dans lequel chacun des premier et second mots de données contient en outre des codes de correction d'erreur qui garantissent que les premier et second mots ont été reçus dans des créneaux temporels consécutifs.
EP85905981A 1984-12-31 1985-11-05 Systeme radio a partage de plusieurs canaux d'emission Expired - Lifetime EP0210181B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP90117730A EP0411677B2 (fr) 1984-12-31 1985-11-05 Système radio à partage de ressources
AT85905981T ATE67908T1 (de) 1984-12-31 1985-11-05 Funkverbindungssystem mit kanalverteilung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68781084A 1984-12-31 1984-12-31
US687810 1984-12-31

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP90117730A Division EP0411677B2 (fr) 1984-12-31 1985-11-05 Système radio à partage de ressources
EP90117730.3 Division-Into 1990-09-14

Publications (3)

Publication Number Publication Date
EP0210181A1 EP0210181A1 (fr) 1987-02-04
EP0210181A4 EP0210181A4 (fr) 1987-10-19
EP0210181B1 true EP0210181B1 (fr) 1991-09-25

Family

ID=24761949

Family Applications (2)

Application Number Title Priority Date Filing Date
EP85905981A Expired - Lifetime EP0210181B1 (fr) 1984-12-31 1985-11-05 Systeme radio a partage de plusieurs canaux d'emission
EP90117730A Expired - Lifetime EP0411677B2 (fr) 1984-12-31 1985-11-05 Système radio à partage de ressources

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP90117730A Expired - Lifetime EP0411677B2 (fr) 1984-12-31 1985-11-05 Système radio à partage de ressources

Country Status (10)

Country Link
US (1) US4692945A (fr)
EP (2) EP0210181B1 (fr)
JP (2) JPS62500977A (fr)
KR (1) KR880700558A (fr)
AT (2) ATE67908T1 (fr)
AU (1) AU574994B2 (fr)
CA (1) CA1236165A (fr)
DE (2) DE3588080T3 (fr)
HK (1) HK1000873A1 (fr)
WO (1) WO1986004199A1 (fr)

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Also Published As

Publication number Publication date
ATE133827T1 (de) 1996-02-15
ATE67908T1 (de) 1991-10-15
US4692945A (en) 1987-09-08
EP0411677A3 (en) 1991-07-31
DE3588080T3 (de) 2003-01-16
JPS62500977A (ja) 1987-04-16
WO1986004199A1 (fr) 1986-07-17
EP0411677B1 (fr) 1996-01-31
EP0210181A1 (fr) 1987-02-04
DE3588080D1 (de) 1996-03-14
DE3588080T2 (de) 1996-08-22
HK1000873A1 (en) 1998-05-01
JPH06188912A (ja) 1994-07-08
DE3584248D1 (de) 1991-10-31
AU5196086A (en) 1986-07-29
CA1236165A (fr) 1988-05-03
AU574994B2 (en) 1988-07-14
EP0210181A4 (fr) 1987-10-19
KR880700558A (ko) 1988-03-15
EP0411677A2 (fr) 1991-02-06
EP0411677B2 (fr) 2002-08-14

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